Create your own at Storyboard ThatPrimitiveEarthEarth4.6BYAEarth3.9BYA﻿DevelopmentofSpeciesEvolutionofSpeciesPresentEarthPrimitiveEarthhadatoxicatmospherethatwastoohostileforanylifetoexist.Earth4.6BYAstartedtocoolfrommoltenintorocks,butwasstilltohostileforlife.Earth3.6BYAhadconditionsinwhichthefirstsignsoflifeerupted;microscopicorganisms.Asthesemicroscopicorganismsdevelopedandincreasedwiththeworldbecomingmoreadaptable,theystartedtodevelopintothefirstearlyspecies.Commonancestraloriginofspecies.Naturalselectiongivesustheanimalsandspeciesweseetoday,whichalldevelopedfromacommonancestor.